JP4530489B2 - Metering device - Google Patents

Description

[0001]
The present invention relates to a treatment when a change in weight occurs during discharge in an apparatus for quantitatively discharging an object to be weighed.
[0002]
[Prior art]
A device called a hopper scale is widely known as a weighing machine that quantitatively fills or discharges an object to be weighed. In the fixed-quantity filling, a target value (hereinafter referred to as a predetermined amount) is set in advance, and an object to be weighed is supplied to a hopper attached to the weighing machine, or an empty container is placed in the weighing machine. After placing the tare, supply the object to be weighed to the container. When the supply amount is close to the predetermined amount, the supply amount per hour is decreased and supplied, and when the predetermined amount is reached, the supply is stopped and the predetermined amount is obtained. First weigh out and take out a certain amount from it. From the weighing machine, it is a weight loss metering. It is also a predetermined amount, and a predetermined amount is set in advance from the value of the unspecified amount weighed first. Is subtracted and stored, the object to be weighed in the hopper attached to the weighing machine is discharged, and if the result matches the stored value, the discharge is stopped and a predetermined amount is measured.
[0003]
[Problems to be solved by the invention]
In the hopper scale as described above, for example, in the case of weight reduction weighing, first, an unspecified amount is put into the hopper and weighed, and a small amount is taken out from the hopper to obtain a fixed amount. It is assumed that the value of the unspecified amount put into the hopper is larger than the quantitative value. Accordingly, it is possible to obtain a certain number of quantifications from the unspecified amount. However, if there is no unspecified amount of objects to be weighed in the weighing hopper before reaching the fixed quantity and there is a shortage for the fixed quantity, the discharging operation is performed but the measured object is not discharged, so the discharge operation is temporarily stopped. It will be canceled. The weighing hopper must be supplied with new objects to be weighed, but if the objects to be weighed disappear and the discharge operation is stopped before reaching the fixed quantity, the discharge amount up to that point is temporarily stored. After that, a new object to be weighed is supplied to the weighing hopper, the value is memorized, the value is memorized, and the discharge for continuously obtaining the quantity is resumed. However, in the past, when there is no object to be weighed in the weighing hopper before reaching the fixed amount, it is necessary to temporarily stop the discharging operation at that time, so it is necessary to provide a switch to notify the suspension of the weighing. there were. Also, it is necessary to have a means to record the weight value in the middle of quantification and set the remaining amount in preparation for resumption, or to instruct the weighing hopper to supply a new object to be weighed. It would be desirable to improve the apparatus in the case of interruption.
[0005]
[Means for Solving the Problems]
Accordingly, the first invention is to obtain a weighing object having a target weight, comprising a weighing device for weighing the weighing object, a weighing container for temporarily storing the weighing object, and a device for discharging the weighing object. In this quantitative weighing device, a device for discharging an object to be weighed with an ability within an allowable range, an allowable weight change amount setting means for setting a value of an allowable weight change amount per unit time, and a predetermined amount as a target weight A predetermined amount value setting means for presetting the value of the weight, a weighing means for successively measuring the amount of decrease in the object to be weighed, and a weight change amount of the object to be weighed that decreases by a certain amount within the allowable weight change amount during measurement. Means for outputting a signal notifying the abnormality of measurement when the weight change amount of the object to be weighed is not recognized within a certain period of time, and a certain amount within the allowable weight change amount; The weight change of the object to be weighed decreases with Means for measuring the weight change amount when the weight change amount exceeding the allowable weight change amount is generated, and means for invalidating the weight change amount when the weight change amount exceeding the allowable weight change amount is generated. Means for adding the difference in weight value from the weight value at the start of weighing at the timing of occurrence to the immediately before occurrence of the weight change amount exceeding the allowable weight change amount to the integrated value register as a measured value, and the weight change When the amount falls within the allowable weight change amount, the weight value at that time is used as a weight value at the start of weighing, the weighing value is accumulated in the accumulated value register, and the accumulated value is the value of the predetermined amount. And a means for outputting a measurement end signal when the two coincide with each other.
[0006]
Furthermore, the second invention is to obtain an object to be weighed having a target weight, comprising a weighing device for weighing an object to be weighed, a weighing container for temporarily storing the object to be weighed, and a device for discharging the object to be weighed. In this quantitative weighing device, the device that discharges the object to be weighed with the capacity within the allowable range is the screw feeder, and the weight change amount of the object to be weighed that decreases by a certain amount within the allowable weight change amount during the weighing is the above-mentioned allowable value. When the weight change amount is less than or equal to the value within the weight change amount and the weight change amount is not recognized for a certain period of time, a means for outputting a signal indicating measurement abnormality, and the object to be weighed are discharged from the measurement container by the signal generated by the means Means for temporarily stopping the device, and means for inputting an operation start signal for starting operation when the measurement abnormality can be confirmed and the operation can be restarted after the cause of the measurement abnormality is removed. It is characterized by resuming the discharge by inputting the start signal.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a quantitative weighing device according to the present invention will be described with reference to the drawings. FIG. 1 is one example of the present invention, and is a conceptual diagram mainly of a powder particle measuring device. Reference numeral 11 denotes a weight detector, and reference numeral 12 denotes an arbitrary amount to be weighed with a single injection of a granular material of an object to be weighed. Reference numeral 13 denotes a first shortage that is quantitative after starting re-discharge. 14 is an amount discharged for the first time and less than a predetermined amount, 15 is a receiving container, 16 is a screw feeder for discharge, 17 is a discharge drive unit, 8 is a controller, 9 is a setting operation unit, and 20 is a weighing hopper. FIG. 2 is a graph showing the normal operation state of the powder particle measuring device shown in FIG. Details will be described later.
[0011]
The embodiment shown in FIG. 1 measures powder particles, and supplies an arbitrary amount of an object to be weighed to the weighing hopper 20 and measures it. Then, the measured value is stored and discharged to the receiving container 15 positioned below by the discharging screw feeder 16. When the discharge amount reaches a predetermined amount (target amount), the discharge is stopped and the predetermined measurement is finished. However, there is a case where the amount weighed at once by the weighing hopper 20 is smaller than a predetermined amount. In other words, the mode of FIG. 1 is a case of measuring a larger amount than the weighing hopper (maximum amount that can be measured), and there is no object to be weighed in the weighing hopper until the predetermined amount is reached, and additional weighing is repeated a plurality of times. This is an embodiment when the need arises.
[0014]
【Example】
The embodiment of the present invention will be described in more detail with reference to FIGS. Since the present embodiment is a quantitative weighing device that is applied when the amount to be measured at one time by the weighing hopper 20 is smaller than the predetermined amount as described above, the objects to be weighed in the weighing hopper 20 are lost and insufficient until the predetermined amount is reached. Minutes occur. Therefore, a new object to be weighed is supplied to the weighing hopper 20 and weighed to compensate for this shortage. This operating state is shown graphically in FIG. In FIG. 2, the vertical axis represents the weight value, and the horizontal axis represents the passage of time.
[0015]
First, the starting point is set by resetting the values so far, and the operation is started with this point as to. The value We of the first weighed object is reduced for a while and then discharged, and then moved to the receiving container 15 provided in the lower stage. Then, the fixed amount discharge state suddenly becomes flat at the time t1, and the discharge operation is performed, but the discharge of the object to be weighed stops and no constant weight change occurs. In this state, an error has occurred in weighing, and a signal for stopping the discharge is output. Therefore, in the present embodiment, the allowable weight change amount is determined in consideration of the normal discharge amount and is set in advance, and when any positive or negative change exceeding the allowable weight change amount occurs, the measurement is stopped at this point. The discharge is stopped. In FIG. 2, it is assumed that a new object to be weighed is input to the weighing hopper 20 at the point t2 and reaches t3. The weight instruction becomes two points. The weight value suddenly changed from point c to point d from t2 to t3. This sudden change is detected as a weight change amount exceeding the allowable weight change amount. The amount obtained by subtracting the weight W10 at point B is stored in the memory as the first discharged value We. The amount thrown at this time is W12-W10, which is a value indicated by Wg, but the amount of change that has increased rapidly in this way is not added and stored as a measured value. That is, this value is canceled as an amount exceeding the allowable weight change amount so as not to affect the quantitative weighing. Therefore, the restart is performed, and the measurement is restarted at the time point t4 when the discharge is restarted. Then, at t5, the discharge stops at the point F. This is because the discharge amount has reached a predetermined amount, and the predetermined amount Wt = We + Wf.
[0016]
Here, the fixed discharge amount of one time is finished. Subsequently, when the receiving container 15 is replaced with an empty container and the measurement is started again, the receiving container 15 is replaced during the period from t5 to t6 in FIG. It is a period. During this time, there is no change in weight, so weighing is not performed. At t6, point E is the discharge restart point. Then, it reaches t7 and is not discharged again, and the operation is stopped. That is, the discharge is stopped for some reason even though the weighing hopper is not empty. Then, the time point t9 is reached, the metering starts again and reaches the h point. Then, a second new object to be weighed is input.
[0021]
Next, the main configuration of the embodiment of the present invention will be described with reference to a block diagram. As shown in FIG. 3, the present invention is roughly composed of eight blocks. Reference numeral 21 denotes a measuring unit, 22 denotes an A / D conversion unit, 23 denotes a calculation / control unit, 24 denotes a display unit, 25 denotes a signal output unit, 26 denotes a storage unit (memory), and 27 denotes a power supply unit. It constitutes a controller. The weighing unit 21 in the block diagram of FIG. 3 corresponds to 11 scales in FIG. In the figure, the weighing unit 21 generates a weight signal proportional to the load, which is converted into a digital weight signal by 22 A / D conversion units and sent to 23 calculation / control units. Here, calculation of weight value, comparison with a predetermined amount value, calculation of determination, etc. and control of input / output data from each connection part are performed, and the results are displayed on 24 display parts, and 25 signal output parts Then, a signal notifying that the fixed quantity has been obtained, a signal for stopping driving to the external winding drive unit 7 when a value exceeding the allowable weight change amount is detected, a signal for stopping the discharge of the object to be weighed, etc. Is output.
[0022]
The storage unit 26 includes a predetermined amount value register 26a, an integrated value register 26b, and a change amount register 26c as predetermined value setting means for setting a predetermined amount of a target weight in advance. Further, when a weight change amount exceeding the allowable weight change amount occurs, a graph 26d outside the allowable change amount as means for invalidating the weight change amount, a weighing start weight register 26e, a weight value shift register 26f, and an allowable range capability At least an allowable change register 26g, a reading count register 26h, and a weight storage register 26i as an allowable weight change setting means for setting a value of an allowable weight range per unit time for discharging an object to be weighed. Before starting the measurement, the allowable change amount register 26g inputs a predetermined change amount range as the allowable weight change amount from the setting operation unit 9, and the quantitative value register 26a inputs the measurement value to be measured. That is, a predetermined amount value is input from the operation unit 9 in advance. The setting operation unit 9 is provided with a measurement start switch 26k.
[0023]
FIG. 4 shows a flowchart of an embodiment of the present invention, and the operation will be described with reference to this flowchart. First, the measurement start switch 28 of the setting operation unit 9 is operated to enter the operation of inputting a measurement start signal from the operation unit, and the process before reading the weight in step S2 is performed. That is, the weight of the weighing object on the supply side is stored in the weighing start weight register 26e and the weight value shift register 26f. The weight value shift register 26f stores at least two weight values. One is a weight value read in advance and the other is a current weight value obtained by sequentially updating the read weight value to new data. is there. Next, the graph 26d outside the allowable change amount is turned OFF, the integrated value register 26b is first cleared to zero, the read count register 26h is reset, the weight value is stored in the weight value storage register 26i, and the operation proceeds to step S15. It will start. Then, the process proceeds to step S3. In S3, the current weight value is read and stored in the weight value shift register 26f. Since the operation has already been started, for example, in the case of the powder particle measuring device in FIG. 16 is activated. When the screw feeder 16 is activated, the objects to be weighed 12 in the hopper 20 start to decrease, and a weight change occurs in the weight value in the hopper, thereby proceeding to step S4. In S4, a new weight value in the weight value shift register 26f is obtained. And the weight value sampled one time before are compared by the calculation / control unit 23. If the difference is smaller than the value of the allowable change amount register 26g stored in advance, the process proceeds to step S5. In S5, it is confirmed whether or not the graph 26d outside the allowable change amount is ON. If not, the process proceeds to Step S6. In S6, the change in the weight value is stored and updated in the change amount register 26c from the start of measurement. . Then, the counter of the read count register 26h is incremented by one. Then, it progresses to step S11. Next, in S11, it is confirmed whether or not the read count register 26h has overflowed. The reading count register 26h is a counter that generates an overflow every certain period and generates a monitoring event as to whether or not the object to be weighed has an appropriate weight change every time the overflow occurs. If no overflow has occurred, the process proceeds to step S7. In step S7, the arithmetic / control unit 23 compares the sum of the change amount register 26c and the integrated value register 26b with the predetermined amount value register 26a. If not, the process returns to S3 and returns to S3, S4, S5. , S6, S11 and S7 in this order until the quantification is obtained. When the sum of the change amount register 26c and the integrated value register 26b coincides with the predetermined amount value register 26a, the process proceeds to step S10, and a signal indicating the end of measurement is output from the signal output unit 25.
[0024]
Up to this point, the abnormal weight change does not occur during weighing. For example, when the weight value of the object to be weighed changes suddenly, the new weight value stored in the weight value shift register 26f in S4 is changed. The calculation / control unit 23 compares the weight value obtained when the previous sample was sampled, and when the difference becomes larger than the value of the allowable weight change amount register 26g, an output means, for example, a buzzer or the like is provided. Then, the process proceeds to step S8. In S8, the value of the change amount register 26c updated in S6 is added to the integrated value register 26b, and the change amount register 26c is cleared to zero. Next, the allowable weight change amount outside flag is set to ON, the read count register 26h is reset, and the process returns to S3. If the weight of the scale is unstable, the processes of S3, S4 and S8 are looped to cancel the weight value unnecessary for quantitative weighing. After that, when the weight becomes stable and can be weighed, that is, the difference between the new weight value of the weight value shift register 26f and the weight value of the previous sampling in S4 is the value of the allowable weight change amount register 26g. When it becomes smaller, the measurement is restarted and the process proceeds from S4 to Step 5. In step 5, since the flag outside the allowable weight change amount is ON, the process proceeds to step 9, and in S9, the measurement value whose measurement has been restarted is stored in the measurement start weight register 26e, and the allowable weight change amount outside flag 26d is turned OFF. Proceed to step 7 and then proceed to S7, S3, S4, S5, S6, S11 and S7 and loop until a quantitative value is obtained. When the fixed amount is reached, the process proceeds from step S7 to step 10 to output a stop signal. If the weight change of the object to be weighed does not occur for some reason, the weight value read in S12 and the weight value read in S3 are advanced to step 12 at the timing when the overflow of the read count register 26h in S11 occurs. And check whether there is any change in the weight value. If there is a change, it is determined as normal and the process proceeds to step 13, where the reading count is reset, the weight value read in S3 is stored in the storage register 26i, updated, and the process proceeds to S7. However, when there is no change in the weight value, it is determined that there is an abnormality, and the routine proceeds to step 14, where the reading count register 26h is reset, a measurement abnormality signal is output, and a loop is returned to S3.
[0025]
【The invention's effect】
According to the present invention, in order to discharge an object to be weighed with an ability within an allowable range, a value of an allowable weight change amount per unit time is set, and during measurement, the value is decreased by a certain amount within the allowable weight change amount. When a weight change amount to be measured is not recognized, a signal to notify weighing error is output when the weight change amount of the object to be measured is not recognized. The current value (measurement value) that has changed within the weight change amount can be stored as an integrated value in the integrated value register. Since the addition is performed as in the prior art, it is not necessary to manually read and input the measurement value up to that point, and no input error occurs. Then, for example, when a new object to be weighed is supplied to the weighing hopper and the fluctuation in weight is settled and weighed, it enters the allowable weight change amount and automatically starts weighing. In other words, do quantitative weighing by weighing only the weight change amount of the object to be weighed that decreases by a certain amount, and if a weight variation amount exceeding a certain amount occurs, cancel the variation amount so that the quantitative weighing is not affected. I have to. In other words, even if the weighing machine receives a shock from the outside temporarily, the weight change due to the shock is automatically canceled, so there is an advantage that the value for the weight fluctuation does not become a weighing error. In addition, even when the quantity of objects to be weighed is relatively large and the quantity is obtained by repeatedly adding the measurements over several times, the operator only needs to supply a new object to be weighed. Even if it is not a skilled worker, there is an effect that the operation burden can be reduced without causing a measurement error.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a powder particle measuring device according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram illustrating an operation state of the apparatus shown in FIG. 1 according to an embodiment of the present invention.
FIG. 3 is a block diagram showing a main configuration of an embodiment of the present invention.
FIG. 4 is a flowchart for explaining the operation of the embodiment of the present invention.
[Explanation of number]
8 Control Unit 9 Setting Operation Unit 11 Weight Detector 12 Object 15 Receiving Container 16 Discharge Screw Feeder 17 Discharge Drive Unit 21 Weighing Unit 22 A / D Converter 23 Arithmetic / Control Unit 24 Display Unit 25 Signal Output Unit 26 Memory Part 27 Power supply part A First discharge start point B Point where the object to be weighed in the weighing hopper disappears and discharge stops c Supply start point for supplying the object to be weighed to the weighing hopper To the discharge restart point Stop discharge by a specified amount (measurement complete)
G Point where discharge stopped for some reason during quantitative discharge The point where the object to be weighed in the weighing hopper disappeared and the discharge stopped. Like the case of We, the quantitative discharge amount Wf at the first time. Quantitative discharge amount Wg from point to point Second supply amount Wp Allowable weight change amount Wt Predetermined amount

Claims (2)

Allowable in a quantitative weighing device for obtaining an object to be weighed with a target weight, comprising a weighing device for weighing an object, a weighing container for temporarily storing the object to be weighed, and a device for discharging the object to be weighed a device for leaving discharge the objects to be weighed by the capacity of the range, the allowable weight change amount setting means for setting the value of the allowable weight change per unit time, and sets the value of the predetermined amount as a target weight previously a metering means for a small amount reduced a predetermined amount value setting means and the objects to be weighed can be sequential weighing, weight change amount is the allowable change in weight of reduced low to the objects to be weighed in a predetermined amount of the allowable weight change amount in during metering when the change in weight of the objects to be weighed at a value less and and a certain period of the inner is not observed, and means for outputting a signal indicating abnormality of the metering, the to decline at a constant amount of the allowable change in weight in Means for measuring the amount of change in weight of an object as a weight value And means for disabling the said weight change amount when the change in weight of more than the allowable change in weight occurs, when the change in weight of more than the allowable change in weight occurs at the timing when the weight variation occurs and means for adding the integrated value register the difference between the weight value from the weight values at the start of weighing until just before the change in weight of more than the allowable change in weight occurs as weighing, the weight change amount is the allowable Means to start weighing when the weight change amount is within the weight value at the start of weighing, and when the measured value is integrated in the integrated value register, and the integrated value matches the predetermined value And a unit for outputting a measurement end signal. Allowable in a quantitative weighing device for obtaining an object to be weighed with a target weight, comprising a weighing device for weighing an object , a weighing container for temporarily storing the object to be weighed, and a device for discharging the object to be weighed The device that discharges the object to be weighed with the capacity within the range is the screw feeder, and the weight change amount of the object to be weighed that decreases by a certain amount within the allowable weight change amount during measurement is less than the value within the above allowable weight change amount. When the weight change amount is not recognized for a certain period of time, a means for outputting a signal for informing the weighing abnormality and a device for discharging the object to be weighed from the measuring container by the signal generated by the means are temporarily stopped. means and, when the metering abnormality enables restarting operation after removing the cause of the possible metering abnormality confirmation comprises means for inputting the operation start signal for starting the operation, enter the operation start signal The quantity measuring device according to claim 1, characterized in that to resume the discharge by.

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